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利用线性不稳定性理论研究了旋转气体介质对黏性环膜液体射流破碎的影响。研究结果表明,无论是轴对称模式还是非轴对称模式,由液体环膜内部气体介质旋转所产生的离心力是液体射流的失稳因素,有助于液体射流的破碎。另外,由液体环膜外部气体介质旋转所产生的离心力是液体射流的促稳因素,不利于液体射流的破碎。当相同强度的旋转同时存在于内部和外部气体介质中时,对于轴对称模式,内部气体介质的影响显著,而对于非轴对称模式,则外部气体介质的影响更为明显。通常情况下,非轴对称模式的扰动增长率强于轴对称模式的扰动增长率,因此会在环膜液体射流的破碎中占据主导地位。
The linear instability theory was used to study the influence of rotating gas medium on the jet breakup of viscous membrane. The results show that the centrifugal force generated by the rotation of the gas inside the liquid ring membrane is the destabilizing factor of the liquid jet in both the axial symmetry mode and the non-axisymmetric mode, which contributes to the breakage of the liquid jet. In addition, the centrifugal force generated by the rotation of the gas medium outside the liquid ring membrane is a stabilizing factor of the liquid jet, which is not conducive to the breakage of the liquid jet. When the same intensity of rotation is present in both the internal and external gas media, the influence of the internal gas medium is significant for the axisymmetric mode whereas the effect of the external gas medium is more pronounced for the non-axisymmetric mode. In general, the non-axisymmetric modes show a stronger rate of turbulence growth than the axisymmetric modes and therefore dominance of the toroidal fluid jets.